Mold for making concrete staves.



L. G. COVAULT & I. D. REESE. MOLD FOR MAKING CONCRETE STAVES.

APPLICATION FILED NOV. 26, 1912.

1,1 1 3,957. Patented Oct. 20, 1914.

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L. 0. OOVAULT & J. D. REESE.

MOLD FOR MAKING CONCRETE STAVES.

APPLIUATION FILED NOV. 26, 1912.

1, 1 1 3,957. Patented 001;. 20, 1914.

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* LEWIS c. COV'AULT AND JOHN D. REESE, ormncnANrosisnnefonrd MOLD FQRMAKING oo onE'rn s rnvns.

= Be it. known that e, LEWISIC, CovAnnT and JOHN D. Rnnsn, citizensof the Unitedj States, residing at lvlechanicsburg, in the have invented, .nevv "and useful Improve ments in Molds for MakingConcrete Staves, of which the following-is a'specification.

This invention relates to amold formalc,

ing concrete 'staves or building blocks 'deslgned especially for use 1n the construction of silos and similar buildings, the object.

may be adjusted to vary its curvature, ,andby means of Which hollovv blocks having tongue and grooved ends and grooved sides may be made, forltheproduction of securejoints in their use in .a. building structure.

The invention consists of the featuresof construct on, combination and arrangement of parts hereinafter fully. described and claimed, reference .being had to the accompanying drawings, in Which;.

Figure 1 is an end elevation ofa concrete stave mold constructed inaccordancevvith our invention. .Fig. 2 is a side elevation of the same. Fig. 3 is a horizontal longitudinal section on the line 33 of Fig. 1. Fig. 4-

is a vertical longitudinal section on the line verse section through the mold. ,F'igsf6 and 7 are views of one of I the complete concrete staves.

Referring to the drawings a suitable base supporting a pair of parallel longitudinal sills 2 connected byiend pieces- 3, and formingtheqfrarneproper of the.

mold, the said sills being .iprovided", With curved or rounded upper edges 41 Supported upon the said framestruoture is a mold comprising side :Wfill$. 5 and -G,,'fend Walls 7 and 8, and, a transversely curved bottom wall 9. The side Walls5 and6 are m ried bybracket arms 10'hinged to the sills Specification of Letters Patent. "Patented Oct. 20,1914. Application filed November A6,.IQIQ i w lls. to l swung ou a d a d aware ."Wh l th nd. 1 Wel a d sim la y ar e y I jbracket armstll hinged to, the end pieces to be opened and c losed. at difierent periods in; the process 0f the stave. As Sl'lOWIli the sideanse and 6 are inclined ath zner nd ei lat eed velfsed upw d y 3 and; outwardly ither-elation to each other,

whilethe}endvvallsflareQarranged perpenlongitudinallyextending V-shaped ribs 12 for the fpurposeof producing correspond ingly shaped longitudinal. grooves in the side edges of the stave, While the end Walls Land ,8 are respectivelyprovided with a transverse rib;13 and.a groove 14 ,ofthe shapes described. ion thepurpose of {produoing awgroove in oneend .of [the stave and tongue atithe opposite end thereof.

The sidepwallsere.provided at their opposite, ends With hooked keepers ,15 adapted too be engaged by hooked ,pivoted latches 1.6 on the end" walls, 61- holding the said walls of the mold in closed relation., ln the side edges ofthe end walls are,formed recesses 17. to receive itheyends of the ribs 12 on the side -.Walls, .wherebyfsaid ribs are also utilized, as suppleinentary fastening memberspto assistiin holding thewalls ,ot

the mold invclosedposition. Openings 18 are provided in the. end Walls for they reception of core tubes 0rrods designed to form openings in the body .o f the staves, .for the production of hollow all staves.

The'bottomwall9 of the moldiis composed of a) thin flexible metallic. plate adapted to rest at its end edges upon flanges 19, on 'theendvvalls. The saidjivall 9 has secured thereto central. and terminal transverse fiexible. metallic strips 20Q-having [eX- tended ends 21 provided with elongatedslots 22; These endsoll the strips form per and lower surfaces of the ends 21,.

whereby in the vertical adjustment of the screws the strips, and consequently the wall or plate 9, are adapted tomove therewith and to be bent or flexed accordingly. Each screw has a lower threaded end 25 working in a threaded opening 26 in the base 1 and is provided at its upper end with a handle .27 orhead for theapplication of a wrench or suitable tool whereby it may be adjusted.

It will'be seen from the foregoing description that by adjusting the screws 23, the curvature of the bottom plate 9 may be varied, so that it will provide a forming surface curved on any desired radius within certain limits, for the production of correspondingly curved staves or building blocks. The bottom 9 having been, in the use of the mold, previously adjusted as desired, the walls of the mold are folded in and latched in closed position, the concrete 0r other plastic material. tamped in up to the line of the openings 18, the 'core rods or tubes then inserted, and the remainder of the concrete or plastic material filled and. tamped in to the desired. level. It will, of course, be understood that the wall 9 forms the inner surface of the stave or block and that any suitable top plate, curved to the desired radius, may be employed to form the curved outer face of the block, or that the material may be properly shaped by hand manipulation to give the proper curvature to the back of the block. The stave having been formed, the latches16 are adjusted to disengage the keepers 15, thus releasing the walls which are swung forthe removal of the formed stave or block. 1

' In Figs. 6 and 7 we have shown a curved stave o rlolock 28 of the character produced by the mold, from which it willbe seen that this stave or block. isprovided with longitudinal openings 29 formed by the core rods or tubes, side edges 30 having the proper bevel. proportionate to the arc of curvature for abutment against the side edges of adjacent staves in the production of a wall of the intended diameter, said side edges being provided with longitudinal l-shaped grooves 31, and end edges 32 and 33 respectively, provided with a V-shaped tongue 34 and a V-shaped groove 35. st'aves or blocksare arranged with their side edgesabutting in'the formation of a wall and with their end edges abutting against the end edges of adjacent upper and lower The annular rows of tiers of staves, the respective tiers of staves being arranged to break joint in the usual way. When the edges of abutting staves or blocks are brought together, the meeting faces thereof are coated with a suitable binder such as hot pitch, tar or asphalt, which fills the grooves and forms an air-tight joint which will allow expansion and contraction without checking or cracking. The rows or tiers are also preferably bound together by bands which overlap their end edges, thus producing a firm and secure wall.

From the foregoing description, taken in connection with the drawings, the construction, mode of operation and advantages of our improved mold will be readily understood, and it will be seen that a mold for the purpose described is provided which is sim-' ple of construction and capable of being conveniently handled for the production of staves or blocks, which vary in curvature, in a rapid and economical manner.

We elaim:-

1. A mold of the character described comprising a base frame including sills having curved or rounded upper edges, hinged side and end walls, the said end walls being provided with base flanges, the side walls extending upwardly in diverging relation and the end walls being longitudinally curved, a

correspondingly curved bottom wall resting upon the flanges of the end walls and having extensions resting upon the rounded edges of the sills and projecting beneath and beyond the side walls, and means upon the base frame engaging said extensions to bend or flex and vary the curvature of said bottom wall.

2. A mold of the character described comprising a base frame including sills having curved or rounded upper edges, substantially diverging side walls hinged to the base frame and provided on their inner faces with longitudinally extending ribs, longitudinally curved end walls hinged to the base frame and provided with base flanges and having recesses receiving the ends of said ribs, one of said end walls being provided with a longitudinally extending groove, a curved bottom wall resting upon the flanges of the end walls and provided with extensions resting upon the rounded edges of the sills and projecting beneath and beyond the side walls, and means upon the frame engaging said extensions to bend or flex and vary the curvature of said bottom wall.

3. A mold of the character described comprising a base frame including sills having curved or rounded upper edges, hinged side and end walls, the said end walls being provided with base flanges, the side walls extending upwardly in diverging relation and the end walls being longitudinally curved,

a curved bottom wall resting upon the In testimony whereofwe affix our signaflanges of the end Walls and provided with tures in presence of two Witnesses. slotted extensions, resting on the rounded LEWIS O COVAULT edges of the sills and projecting beneath and beyond the side Walls, and adjusting devices upon the base frame engaging said Witnesses: slotted extensions to bend or flex and vary J OSE'PH C; LEGGE, the curvature of said bottom Wall. T. B. WARE.

JOHN D. REESE.

copies at this patent may be obtained for in cents each, by addressingthe Commissioner 0! Patents,

Wellington, D. 0." 

